Benghazi consulate attacks

Pakistani protesters shout anti-U.S. slogans at a rally in Rawalpindi, Pakistan on Friday, Sept. 21, 2012. Pakistan has blocked cell phone service in major cities to prevent militants from using phones to detonate bombs during a national day of protest against an anti-Islam film produced in the United States. (AP Photo/B.K. Bangash)

Four Americans were killed in the September 2012 attack on the U.S. diplomatic compound in Benghazi, Libya, including the U.S. ambassador to Libya, Christopher Stevens. (Reuters)